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DS1961S-F5+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36
DS1961S
10 of 36
Figure 7-1. MEMORY AND SHA FUNCTIONS FLOW CHART
0Fh
Write Scratch-
pad ?
Master
TX Reset ?
Master TX Data Byte
To Scratch
p
ad
Bus Master TX
TA1
(
T7:T0
),
TA2
(
T15:T8
)
Y
N
N
YN
Address
< 90h ?
Y
Bus Master
RX “1”s
Master
TX Reset ?
Y
N
DS1961S Sets Scratchpad
Byte Counter = 0,
Clears PF, AA,
Sets T2:T0 = 0, 0, 0,
Sets E2:E0 = 1, 1, 1
Byte Counter
= 7 ?
DS1961S TX CRC16
of Command, Address,
Data Bytes as They
Were Sent by the Bus
DS1961S
Increments
B
y
te Counter
Master
TX Reset ?
Y
N
Bus Master
RX “1”s
Partial
Byte ?
PF = 1
Y
N
N
Y
To Figure 7
2nd Part
From Figure 7
2nd Part
Bus Master TX Memory
Function Command
To ROM Functions
Flow Chart
(
Fi
g
ure 9
)
From ROM Functions
Flow Chart
(
Fi
g
ure 9
)
DS1961S Sets EN
LFS = 0
Note
:
See the Write
Scratchpad
Description for
A
dditional
Information.
DS1961S
11 of 36
Figure 7-2. MEMORY AND SHA FUNCTIONS FLOW CHART (continued)
AAh
Read Scratch-
Pad ?
DS1961S Sets Scratchpad
B
y
te Counter = 0
Bus Master RX
TA1 (T7:T0), TA2 (T15:T8)
and E/S B
y
te
Bus Master RX
Data B
y
te from Scratch
p
ad
Bus Master RX CRC16
of Command, Address,
E/S Byte, Data Bytes as
Sent b
y
the DS1961S
Y
Bus Master
RX “1”s
Master
TX Reset ?
Y
N
Master
TX Reset ?
DS1961S
Increments
B
y
te Counter
Byte Counter
= 7 ?
Y
Y
N
N
N
From Figure 7
1st Part
To Figure 7
1st
Part
To Figure 7
3rd
Part
From Figure 7
3rd
Part
Note
:
See the Read
Scratchpad
Description for
A
dditiona
l
Information.
DS1961S
12 of 36
Figure 7-3. MEMORY AND SHA FUNCTIONS FLOW CHART (continued)
* 1-Wire Idle High for Power
From Figure 7
2nd Part
To Figure 7
2nd Part
To Figure 7
4th Part
From Figure 7
4th Part
5Ah
Load First
Secret ?
Bus Master TX
TA1 (T7:T0), TA2 (T15:T8)
and E/S B
y
te
Y
N
Bus Master
RX “1”s
Master
TX Reset ?
Y
N
Note
: The 8-Byte Secret Must
First be Written to the
Scratch
p
ad.
Y
Auth. Code
Match ?
N
Address of
Secret ?
Y
N
N
Write-
Protected ?
Y
DS1961S Copies Scratch-
Pad Data to Address
A
A = 1
*
DS1961S TX “0”
Master
TX Reset ?
Master
TX Reset ?
Y
N
DS1961S TX “1”
N
Y
Address
<7Fh ?
N
Y
EN_LFS Flag
= 1 ?
N Y
Duration: t
PR
OG
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36

DS1961S-F5+

Mfr. #:
Buy DS1961S-F5+
Manufacturer:
Maxim Integrated
Description:
iButtons & Accessories 1kb Protected EEPROM iButton w/SHA-1 Eng
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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